GitLab Pages & Jekyll do not allow dots in permalinks

Summary

GitLab Pages & Jekyll do not allow dots in permalinks, resulting in a 404 error.

Steps to reproduce

1. Fork the Jekyll repo
2. Update _config.yml to match new site
3. Add a new page with a dot in the permalink
4. Build the site and navigate to the permalink (this should result in a 404 error)

Example Project

• example project link
• example project page
• example project permalink(i.e. the one that should work but doesn't)

What is the current bug behavior?

The page is not found (404 error)

What is the expected correct behavior?

The page should be correctly served

Relevant logs and/or screenshots

N/A

Output of checks

This bug happens on GitLab.com

Results of GitLab environment info

N/A

Results of GitLab application Check

N/A

Possible fixes